Specify version of some dependencies to ensure build

Author: hansu

package.json

@@ -1534,11 +1534,15 @@
 		"iconv-lite": "0.5.0"
 	},
 	"devDependencies": {
+		"@types/babel__core": "7.1.18",
+		"@types/babel__traverse": "7.14.2",
 		"@types/jest": "26.0.19",
 		"@types/node": "8.10.62",
+		"@types/prettier": "<2.6.0",
 		"@types/vscode": "1.38.0",
 		"@typescript-eslint/eslint-plugin": "4.10.0",
 		"@typescript-eslint/parser": "4.10.0",
+		"@vscode/vsce": "^2.19.0",
 		"eslint": "7.15.0",
 		"jest": "26.6.3",
 		"ts-jest": "26.4.4",